A. Batliner, C. Hacker, M. Kaiser, H. Mögele, and E. Nöth. Proceedings of AVSP'07: International Conference on Auditory-Visual Speech Processing, Kasteel Groenendaal, Hilvarenbeek, The Netherlands, (2007)
M. Keally, G. Zhou, G. Xing, J. Wu, and A. Pyles. Proceedings of the 9th ACM Conference on Embedded Networked Sensor Systems, page 246--259. New York, NY, USA, ACM, (2011)